Learn a Fact: 1 x 9

1
5
x  1
2
5
x  0
3
7
x  1
4
1
x  8
5
0
x  1
6
1
x  6
7
0
x  3
8
2
x  1
9
4
x  1
10
0
x  4
11
1
x  9
12
7
x  0
13
0
x  9
14
3
x  1
15
8
x  0
16
0
x  6
17
2
x  0
18
1
x  1

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